# Robust handling of missing messages with retry

**URL:** <https://discourse.nodered.org/t/robust-handling-of-missing-messages-with-retry/93871>\
**Category:** General\
**Tags:** modbus\
**Created:** [12 December 2024 10:31 UTC](https://discourse.nodered.org/t/robust-handling-of-missing-messages-with-retry/93871 "2024-12-12T10:31:37Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ThingsTinkerer](https://avatars.discourse-cdn.com/v4/letter/t/91b2a8/32.png) [@ThingsTinkerer](https://discourse.nodered.org/u/ThingsTinkerer)\
**Post date:** [12 December 2024 10:31 UTC](https://discourse.nodered.org/t/robust-handling-of-missing-messages-with-retry/93871/1 "2024-12-12T10:31:37Z")

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I don't have a lot experience with Modbus, so bear with me. When using modbus flex-getter, if anything fails, the message disappears - no output. And yes, I have enabled warning and error checkboxes to no avail.

Not sure what the root cause is, as I'm left blind without any output. How about a retry mechanism with a delay of x seconds? Is there any ready-made examples of this in node red? Doesn't need to be related to modbus in particular, but a general purpose way of handling missing messages.

I'm playing around with function nodes to make duplicate message, send it around the faulty node, then join after.

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**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [12 December 2024 11:14 UTC](https://discourse.nodered.org/t/robust-handling-of-missing-messages-with-retry/93871/2 "2024-12-12T11:14:47Z")

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did you try adding a catch node pointed at the failing node?

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<div class="post-metadata">

**Author:** ![ThingsTinkerer](https://avatars.discourse-cdn.com/v4/letter/t/91b2a8/32.png) [@ThingsTinkerer](https://discourse.nodered.org/u/ThingsTinkerer)\
**Post date:** [12 December 2024 11:18 UTC](https://discourse.nodered.org/t/robust-handling-of-missing-messages-with-retry/93871/3 "2024-12-12T11:18:09Z")

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Thanks, it felt like I had forgotten something. And after a few attempts, yes indeed errors goes to catch - brilliant!

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [26 December 2024 11:18 UTC](https://discourse.nodered.org/t/robust-handling-of-missing-messages-with-retry/93871/4 "2024-12-26T11:18:38Z")

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